/// <summary>
/// Executes the action on the UI thread asynchronously.
/// </summary>
/// <param name = "action">The action to execute.</param>
public static Task OnUIThreadAsync(this System.Action action)
{
ValidateDispatcher();
#if WinRT
return(dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => action()).AsTask());
#elif NET45
return(dispatcher.InvokeAsync(action).Task);
#else
var taskSource = new TaskCompletionSource <object>();
System.Action method = () =>
{
try
{
action();
taskSource.SetResult(null);
}
catch (Exception ex)
{
taskSource.SetException(ex);
}
};
dispatcher.BeginInvoke(method);
return(taskSource.Task);
#endif
}
/// <summary>
/// Executes the action on the UI thread asynchronously.
/// </summary>
/// <param name="action">The action to execute.</param>
/// <returns></returns>
public virtual Task OnUIThreadAsync(Func <Task> action)
{
ValidateDispatcher();
#if WINDOWS_UWP
return(dispatcher.RunTaskAsync(action));
#else
return(dispatcher.InvokeAsync(action).Task.Unwrap());
#endif
}
private bool InvokeOrBeginInvoke(Action action)
{
// TODO - could consider using _uiDispatcher.get_HasThreadAccess()
_uiDispatcher.InvokeAsync(CoreDispatcherPriority.Normal, (s, a) => action(), this, null);
return(true);
}